Graphene
Graphene is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2014, 2021). Below are those real questions with their correct answers and explanations.
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Real questions that test this
खालीलपैकी कार्बनचे ऑलॅट्रोप कुठले ते सांगा? / The allotropes of carbon are :
(a)कार्बन हलाईड्स / Carbon halides
(b)डायमंड / Diamond
(c)फुलरीन्स / Fullerenes
(d)ग्राफाइट / Graphite
(e)कॅऑईट / Chaoite
Diamond, fullerenes, graphite, and chaoite are well-known allotropes of carbon. Carbon halides are compounds, not allotropes.
खालील दिलेल्या विधानापैकी कोणती विधाने बरोबर आहेत ? / Which of the following statements are correct ?
(a)हिरा विद्युत दुर्वाहक आहे. / Diamond is a non-conductor of electricity.
(b)ग्रॅफाइट मध्ये द्विमितीय पत्रकासारखी संरचना असते. / Graphite has a two dimensional sheet like structure.
(c)ग्रॅफाइट विद्युत वाहक आहे. / Graphite conducts electricity.
(d)खडकाला भोक पाडायला हिरा वापरतात. / Diamond is used for rock drilling.
Diamond is a non-conductor of electricity and is used in rock drilling; graphite has a two-dimensional sheet-like structure and is a good electrical conductor.